Ramsey would go on to bag a hat trick. But equally impressive was Mkhitaryan’s hat trick of assists. He set up the Welshman’s first and third, as well as Aubameyang’s

That’s right, the most expensive player in club history got off the mark on his debut. He should have been flagged offside, but we’ll ignore that small detail for a second. The former Dortmund striker took a through-ball from Mkhitaryan, his former Dortmund teammate, and dinked it over Everton keeper Jordan Pickford.

Pierre-Emerick Aubameyang scores his first goal for Arsenal. (Getty)

It was 4-0 at halftime. It could have been five or six. And, at least for the moment, all was well at Arsenal.

Everton’s second-half defending was similarly shocking. Sam Allardyce got his team selection all wrong, but his players certainly didn’t help him out. They seemed quite content to let Arsenal stream forward in numbers. They pulled a goal back after surviving the continued Gunners’ onslaught, but left Ramsey alone 10 minutes later.

There will be more trying times ahead for Mkhitaryan and Aubameyang in London. Arsenal is still a heavy underdog in the top-four race. It’s problems in midfield and at the back will be more apparent against more coherent and competent opposition.